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单选题北京正负电子对撞机的储存环是周长为240m的近似圆形轨道,求当环中电子电流强度为8mA时,已知电子的速率接近光速,则在整个环中有多少个电子在运行:( )

A.

B.

C.

D.

2023-2024第一学期大学物理Ⅰ（2）课程封面

学科：2023-2024第一学期大学物理Ⅰ（2）

时间：2023-11-05 15:15:12

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如图所示,两段截面积不同、材料相同的金属导体串联在电路中,则下列说法正确的是:( )<img src="https://p.ananas.chaoxing.com/star3/origin/5e4f0c84cf2a800520459fe99994ae77.png">

A. 两段导体中电流密度相同B. 两段导体中电流强度相同C. 两段导体中的电场强度相同D. 以上说法都不正确

北京正负电子对撞机的储存环是周长为240m的近似圆形轨道,求当环中电子电流强度为8mA时,已知电子的速率接近光速,则在整个环中有多少个电子在运行:( )

A. <img src="https://p.ananas.chaoxing.com/star3/origin/f4a67f5b6d890506650f7b97e5c81327.png">B. <img src="https://p.ananas.chaoxing.com/star3/origin/11b140deeaa7c60830c981dfbded178f.png">C. <img src="https://p.ananas.chaoxing.com/star3/origin/53df6bdb6792c286dd8ce9686893712a.png">D. <img src="https://p.ananas.chaoxing.com/star3/origin/940c690262619c72ccd754332b8c135f.png">

一用恒定电阻率为<img src="https://p.ananas.chaoxing.com/star3/origin/fec7e0b10e14c613eccaeede4bf7a909.png">的材料制成的空心半球壳,其内半径为<img src="https://p.ananas.chaoxing.com/star3/origin/35df0db2cfa3ef643a724484fcb4038d.png">,外半径为<img src="https://p.ananas.chaoxing.com/star3/origin/45680269179d353447926f8326332c7b.png">,则该半球壳内外表面之间的电阻R等于( )

A. <img src="https://p.ananas.chaoxing.com/star3/origin/f740531f4b7e95a55d3d34c38c926c27.png">B. <img src="https://p.ananas.chaoxing.com/star3/origin/f7e6684b2fcf8498da23ebbad00eb541.png">C. <img src="https://p.ananas.chaoxing.com/star3/origin/1ed618c627ccd78e79f5f27cee74a045.png"> B.<img src="https://p.ananas.chaoxing.com/star3/origin/1f2fa53c2d13cf19135194d4754a185f.png">

大气中由于存在少量的自由电子和正离子而具有微弱的导电性,晴天时,地表面附近大气的平均电场强度约为<img src="https://p.ananas.chaoxing.com/star3/origin/c8d6be749a09f29db3a79b3a88267f9b.png">,大气中的平均电流密度约为<img src="https://p.ananas.chaoxing.com/star3/origin/becdc20c48ea1032eb13c9b970ad2705.png">,则大气的电阻率<img src="https://p.ananas.chaoxing.com/star3/origin/a7fe7a6e50b1db6908a20bb1622e94c9.png">等于( )

A. <img src="https://p.ananas.chaoxing.com/star3/origin/2b5630a3639f2e6e17d3037e231d7eda.png">B. <img src="https://p.ananas.chaoxing.com/star3/origin/66d69b1dfa8cea838695bec683dbbb17.png">C. <img src="https://p.ananas.chaoxing.com/star3/origin/e1340e836cfbaec569ea5f8b445ccbdd.png">D. <img src="https://p.ananas.chaoxing.com/star3/origin/302b969c329750f85cf826f9cf3d98fc.png">

如图所示,一内外半径分别为<img src="https://p.ananas.chaoxing.com/star3/origin/43da86b3c016fe5d1930f1715f1a2c54.png">和<img src="https://p.ananas.chaoxing.com/star3/origin/b608abe42c61aab9e211894cd7c42409.png">的金属圆筒,长度<img src="https://p.ananas.chaoxing.com/star3/origin/1b734ee5ba07f587fb60def630e61eb4.png">,其电阻率<img src="https://p.ananas.chaoxing.com/star3/origin/05633331fb75d51e5967d3dc3fea4afe.png"> ,若筒内外电势差为<img src="https://p.ananas.chaoxing.com/star3/origin/cab4ee230603a370be5469140ea42590.png">,且筒内缘电势高,圆柱体中径向的电流强度等于( )<img src="https://p.ananas.chaoxing.com/star3/origin/8c52834dd6812a6777c11bb6a44bd160.jpg">

A. <img src="https://p.ananas.chaoxing.com/star3/origin/9feba256d72f494f9097ed17732207b1.png">B. <img src="https://p.ananas.chaoxing.com/star3/origin/b152af084eb32d1ef11413c1bf2e6b37.png">C. <img src="https://p.ananas.chaoxing.com/star3/origin/ed2f9fd9089a31d93581c99e99424cbd.png">D. <img src="https://p.ananas.chaoxing.com/star3/origin/27851deebf3f1c1afd8364be5569a7cf.png">

一铜导线横截面积为<img src="https://p.ananas.chaoxing.com/star3/origin/b3fef8d91e7b056b0ea79fc4a5ed32df.png">,20 s内有80 C的电量通过该导线的某一横截面,已知铜内自由电子的数密度为<img src="https://p.ananas.chaoxing.com/star3/origin/2de5a3a2d25e87624a3c5a7da11160fc.png">,每个电子的电量为<img src="https://p.ananas.chaoxing.com/star3/origin/3c03edbca3220ba07079eb4405b1f32d.png">,则电子的平均定向漂移速率<img src="https://p.ananas.chaoxing.com/star3/origin/4e6b9112cac63e8311b38d929ea8bb9f.png">等于( )

A. <img src="https://p.ananas.chaoxing.com/star3/origin/2d1f20c181c23c1a27b44dc0a44b6f33.png">B. <img src="https://p.ananas.chaoxing.com/star3/origin/f31b2491022a4f150c6a8340a37b9eaf.png">C. <img src="https://p.ananas.chaoxing.com/star3/origin/9774191b30963e1dd04e70aa0be81656.png">D. <img src="https://p.ananas.chaoxing.com/star3/origin/5d4584324daf2589bdb84128d9fd9468.png">

如图所示,一用电阻率为 r 的材料制成的圆台,其高为l,两端面的半径分别为<img src="https://p.ananas.chaoxing.com/star3/origin/28735f8c4cabe7e9a53c0c8619e8b341.png">和<img src="https://p.ananas.chaoxing.com/star3/origin/fad07193bad0511854d963b37aaca19e.png">,则此圆台两端面之间的电阻等于( )<img src="https://p.ananas.chaoxing.com/star3/origin/322d48da7e74b2f5f3c62c11ec2fd32a.png">

A. <img src="https://p.ananas.chaoxing.com/star3/origin/02db31e251f284c4e8338386892bf7fb.png">B. <img src="https://p.ananas.chaoxing.com/star3/origin/5da3bb63f471ccde9413d06e5a691705.png">C. <img src="https://p.ananas.chaoxing.com/star3/origin/35cd1fe987d3203a23366c5fabd1e9eb.png">D. <img src="https://p.ananas.chaoxing.com/star3/origin/5e3ccef56a27fde820b81f3f26878455.png">

通有电流I的无限长直导线弯成如图所示的三种形状,则P、Q、O各点磁感应强度的大小BP、BQ、BO间的关系为( ).<img src="https://p.ananas.chaoxing.com/star3/origin/4137cc193177b4c9d1a6e30bc8022502.png">

A. <img src="https://p.ananas.chaoxing.com/star3/origin/e8a341fbc5cef861808fe84346604467.png">B. <img src="https://p.ananas.chaoxing.com/star3/origin/d74b1317dcd9ab4cda3353173754a69b.png">C. <img src="https://p.ananas.chaoxing.com/star3/origin/8adb7aa1bc53d823320d0c5f52714573.png">D. <img src="https://p.ananas.chaoxing.com/star3/origin/4acd3b345210ea8e665c80b4cd340646.png">

四条相互平行的载流长直导线电流强度均为I,如图示放置.设正方形的边长为2a,则正方形中心的磁感应强度大小为( ).<img src="https://p.ananas.chaoxing.com/star3/origin/b00a3aaf614467e7701e5ece042bc5fd.png">

A. <img src="https://p.ananas.chaoxing.com/star3/origin/11c032d580bce80915e607d7080709ac.png">B. <img src="https://p.ananas.chaoxing.com/star3/origin/3f9adbf7a943121838a9d5ae6abd729b.png">C. <img src="https://p.ananas.chaoxing.com/star3/origin/8b6f05e18ac761e2e22cdf2a1441f47d.png">D. <img src="https://p.ananas.chaoxing.com/star3/origin/d0b5031d015426f6476a896c8554d7d0.png">

如图所示,AA′和BB′为两个正交的圆形线圈,AA′的半径为R,通电流I,BB′的半径为2R,通电流2I,两线圈的公共中心O点的磁感应强度大小为( ).<img src="https://p.ananas.chaoxing.com/star3/origin/04ab162fbf077a17139228f30fbb3e75.png">

A. <img src="https://p.ananas.chaoxing.com/star3/origin/533687af5ce7ca76ecf29692266642a8.png">B. <img src="https://p.ananas.chaoxing.com/star3/origin/3d6c91d5dcede3627d9e211cff6f4735.png">C. <img src="https://p.ananas.chaoxing.com/star3/origin/526ec2091e7551a09bc103ee356e0149.png">D. 0

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